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This commit is contained in:
Alex Janka 2023-02-05 23:07:55 +11:00
parent 587916ed34
commit 7eba1f9586
1 changed files with 37 additions and 8 deletions
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41
src/processor/gpu.rs
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@ -1,6 +1,6 @@
use crate::{FACTOR, HEIGHT, WIDTH}; use crate::{FACTOR, HEIGHT, WIDTH};
use super::{clear_bit, get_bit, set_bit, set_or_clear_bit, CPU}; use super::{as_signed, clear_bit, get_bit, set_bit, set_or_clear_bit, CPU};
#[derive(PartialEq)] #[derive(PartialEq)]
enum DrawMode { enum DrawMode {
@ -20,6 +20,15 @@ enum TiledataArea {
D8800, D8800,
} }
impl TiledataArea {
fn get_addr(&self, addr: u8) -> u16 {
match self {
TiledataArea::D8000 => 0x8000 + (addr as u16),
TiledataArea::D8800 => 0x8800_u16.wrapping_add_signed(as_signed(addr) as i16),
}
}
}
enum ObjSize { enum ObjSize {
S8x8, S8x8,
S8x16, S8x16,
@ -221,7 +230,14 @@ impl CPU {
let scroll_y = self.memory.get(0xFF42); let scroll_y = self.memory.get(0xFF42);
let scroll_x = self.memory.get(0xFF43); let scroll_x = self.memory.get(0xFF43);
let palette = byte_to_palette(self.memory.get(0xFF47)); let palette = byte_to_palette(self.memory.get(0xFF47));
self.render_tiles(scanline, &lcdc.bg_tilemap, palette); self.render_tiles(
scanline,
&lcdc.bg_tilemap,
&lcdc.tile_area,
palette,
scroll_x,
scroll_y,
);
} }
fn render_scanline_window(&mut self, _scanline: u8, _lcdc: &LCDC) { fn render_scanline_window(&mut self, _scanline: u8, _lcdc: &LCDC) {
@ -235,12 +251,25 @@ impl CPU {
fn render_scanline_obj(&mut self, _scanline: u8, _lcdc: &LCDC) {} fn render_scanline_obj(&mut self, _scanline: u8, _lcdc: &LCDC) {}
fn render_tiles(&mut self, scanline: u8, tilemap: &TilemapArea, palette: Palette) { fn render_tiles(
let tile_row = (scanline as usize) / 8; &mut self,
scanline: u8,
tilemap: &TilemapArea,
tiledata: &TiledataArea,
palette: Palette,
offset_x: u8,
offset_y: u8,
) {
let tile_line = (scanline as usize) + (offset_y as usize);
let tile_row = tile_line / 8;
let tile_px = ((tile_line as u16) % 8) * 2;
let row_addr = (tile_row * 32) as u16 + get_tilemap_offset(tilemap); let row_addr = (tile_row * 32) as u16 + get_tilemap_offset(tilemap);
for x in 0..32 { for x in 0..32 {
let lsbs = self.memory.get(row_addr + (x * 2)); let tile_addr = self.memory.get(row_addr + x) + tile_px as u8;
let msbs = self.memory.get(row_addr + (x * 2) + 1); let lsbs = self.memory.get(tiledata.get_addr(tile_addr));
let msbs = self.memory.get(tiledata.get_addr(tile_addr + 1));
// let lsbs = self.memory.get(row_addr + tile_px + (x * 2));
// let msbs = self.memory.get(row_addr + tile_px + (x * 2) + 1);
for px_x in 0..8 { for px_x in 0..8 {
let lsb = get_bit(lsbs, px_x); let lsb = get_bit(lsbs, px_x);
let msb = get_bit(msbs, px_x); let msb = get_bit(msbs, px_x);